43976774

Appears in sequences

• a(n) = Sum_{k=0..floor(n/2)} (-1)^k * binomial(n,2*k)^2.at n=16A307091
• Expansion of sqrt((1-2*x+sqrt(1-12*x+4*x^2)) / (2 * (1-12*x+4*x^2))).at n=8A337390